The class has a small garden.
They want clean water for plants.
The water in the bucket is dirty.
The water looks like brown mud.
The teacher says, " We can help. "
The children look at the muddy water.
They ask, " How can we clean it? "
The teacher smiles and says, " We can filter. "
The children are happy to try.
They will use sand and stones.
They will work together after school.